Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c75c3cf82742148…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 14:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a6870705bb48da78ba2488e49ab295e SHA-1: f3eb84597037d4068b195cf6f2fb7d72e88f6885 SHA-256: 6c75c3cf82742148c338136c43054dbbe0426e56ed4fbeeb463173558d6acbb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains, and is flagged as a link farm on disposable hosting. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dlabiura.kbo.pl/ckfinder/userfiles/files/kasifo.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/movevozuwotatofonif.pdf
    • http://tsyrulnikov.ru/upload/file/riduxuwim.pdf
    • http://patrick-vallot.com/upload/files/xomazore.pdf
    • https://delcinfo.ru/img/files/files/55498955577.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1eb138e7a---31889545540.pdf
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/17883724171.pdf
    • http://kccmaul.com/files/files/47368819071.pdf
    • http://jrpst.pl/userfiles/file/kovinajilaxowali.pdf
    • http://www.gdchgs.com/admin/img/files/zexutol.pdf
    • https://daaeportrett.no/upload/file/18672534138.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133254ab0504---dekumemamimasawugajuwixo.pdf
    • http://fanghsin.com/uploads/files/202109100601241767.pdf
    • http://schokobrunnen.com/idata/54590147508.pdf
    • https://namratalakhotia.com/userfiles/files/govoratamere.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagufukujerizilo.pdf
    • http://koutingchina.com/upload/files/27882417978.pdf
    • http://matras-devison.ru/upload/file/powibamilalirudaloxolo.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/62892591639.pdf
    • https://forumhrdbekasi.com/webroot/userfiles/files/nesirebuwemelawidotibix.pdf
    • http://panteres.com/files/files/55038684230.pdf
    • http://studiotecnicopinto.it/userfiles/files/59847292243.pdf
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/37941491125.pdf
    • http://preciz.com/uploads/wysiwyg/files/zifofoganitokidigis.pdf
    • https://luxm.pl/userfiles/file/54067680355.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cottage+bloxburg+house
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4df.bin
c7a2b44a5bf3f1d4e9951b534259128c6b4ac2afc43571a2ee887e1d09e9fb6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 18088 bytes
font_01_sfnt_off0001036b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 16792 bytes
font_02_sfnt_off00011b82.bin
d19c5b36266e1b73d0b5a284e2d9218817e2d0244bbddf8b7476bedf45b164d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B82 10564 bytes

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